Latax primer over oil based stain - ok?

The wood trim on my house currently has a dark brown, semi-opaque
stain (probably oil based). We plan to change the color to an off-
white (Swiss Coffee) and will be using Duration latex paint, which is
self priming and supposedly goes on pretty thick.
Should I use one coat of stain blocking primer and one coat of paint,
or two coats of the Duration paint? I bought some "ABC" stain
blocking, acrylic latex primer from Sherwin Williams. Does anyone know
if this is any good, or should I be using something else?
Thanks for any advice!

There is no clearcoat or varnish. I'm not 100% certain that it's an
oil based stain on there now. My reasons for suspecting it is are that
there is no peeling at all; only fading/oxidation. On some of thw
wood, it looks to be a thick opaque stain (that looks pretty much like
paint), while other parts (e.g. the patio) seems to have a semi-
transparent stain, as the wood grain is visible. It is rough sewn wood
and I was hoping to just apply the appropriate primer to it without
sanding (I've already pressure washed and repaired damaged areas).

Sorry, I thought you were talking about the interior trim, duh.
The existing finish could be a latex stain which would not peel, or it
could be oil. In any case a good exterior latex primer should be used
1) because the dark color will be hard to cover with Swiss Coffee
white alone and 2) because you are not sure if it is oil (latex over
oil should always be primed). Paint that goes on thick is not
necessarily a good thing, especially exterior. I would definitely go
with one coat of exterior latex primer and one coat of paint, rather
than two coats of paint. The primer can be tinted to match the paint
for better coverage. "Self-priming" is an oxymoron.

In your situation and within the parameters noted, I've had the best
results using 100% acrylic latex solid stain as opposed to paint. You
might wish to discuss this with someone knowledgeable at the Sherwin
Williams store.

One of the painting contractors I spoke to recommended the same thing.
As I recall, the advantages are lack of peeling, showing the wood
grain and ease of application. Everything else I've read indicates
that paint would have a longer usable life. My priority for this house
(soon to be a rental) is long life, thus my choice to paint.

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